Remove old tensorflow docs

[atombaby]

URL of existing content (a rendered, sciwiki.fredhutch.org link)

https://github.com/FredHutch/wiki/blob/main/_compdemos/tensorflow-gpu.md

Specific information requests or concerns, or specific region on page of content to refresh.

This is out of date- all of this is supplied via modules now

@ GitHub username of the listed primary reviewer of the page if known